Razor blade grinding machine



May 14, 1935., w. TOBIAS V RAZOR BLADE GRINDING MACHINE Filed Nov. 26, 1952 Patented May 14,1935

UNlT i n zoR Bn D RINDING MACHINE .qwerner Tobias, BerIin-Sudende, Germany, 'as-. Signor to Aktiebolaget 'Tonsor, Gottcnburg,

' Sw d Application November 26, 1932, Serial No. 644,471

In Germany December '4, 1931 2 Claims. (01. 51-44) f li nvention relates to grinding machines and more"pa'rticularly-, although not exclusively, togrindingmachineS in which each of several r cgrindingdiscs vl'1iis,-tc carry out a definite ,grinding'operation on a piece of work, e. g. the grind- J ingbf-thecutting' edges on a chntinuousprogressedsteelband from which thin razor blades are made. These grinding discs have to be brought outiof engagement with the piece of 10 work during interruptions in working, start with out load on continuation of the grinding operation and then be first again brought near to the piece of work and finally be brought into contact with the work. The retraction and. re-adjustl5 ment of the discs to the exact extent of grinding may be brought about. by arranging the slide supporting the spindle of the grinding disc to be urged by a spring in the work-engaging direction so that on the retraction of the grinding disc it is only necessary to compress the spring. In this case no change need be-made'tothe abutment which is capable of regulation by line adjustment for theexact'positioning of the slide in the work-engaging position so that on representation to the work the disc can be brought exactly into the original working position. .The

invention provided an arrangement for the rea manner that engagement with the work and disengagement may be brought about in common from one position.

In order that the invention maybe clearly understood and readily carried into effect, it will now be explained more fully with reference to the accompanying drawing in which:--

Fig. 1 illustrates in section an example of a grinding apparatus according to the invention,

Fig. 2 is, a section through Fig. 1 according to the lines 2-2, s

Fig. 3 is a side view of a part .of Fig. 1 shown from the left-handside, 4

Fig. 4 is a plan ofa part of Fig. 1 and Fig. 5 is a perspective View of the guiding means for the steel band and Fig. 6 is a front view of a plurality of grinding apparatus according to the invention as arranged as to be commonly engaged and disenaged I ais the grinding'dis c, which is carried with its bearingbusl'iing b in the slide can be moved 7 up and down with' it-in the machine pedestal" ct A.

in the direction oithe arrow e. For the purpose of guiding "the slide 0 within the pedestal d the slideisprovided with ribs o engaging a groove formed-between the edges of the pedestal d and guiding ledges d fastened (mane pedestal by 10 means of screws or the like (see Fig. 2). ,f is the work, which moves perpendicularly to the plane of the drawing between the guides g and h and in this case is ground on the edge 2'. It is here a casefor example, of a continuously moved steel band, on both sides of which cutting edges are ground, whereupon the steelband is divided into individual thin razor blades. The guide 71. is a fixed part of the machine while the guide g is yieldingly held against the guide it by means of screws 9 passing through holes within the guide 9 and being screwed into the guide h, springs g being interposed between the heads of the screws and'the guides g. The steel band is fedto and delivered from said guides h and g by means of rollers h (Fig. 5) V The grinding disc-c is held in the position shown in Fig. l in which it engages the work piece 1 by coming into contact of the support 0 with the abutment surface is of the nut m under the pressure of the spring Z. The nut misguided in a cylindrical part w forming a portion of the pedestalvand is secured against rotation by a guide 11 facing'a flattened portion of said nut and held within the cylinder w by means of a screw 12 The nut m engages the threaded part c of aspindle o journalled on the one side in the bot-tom of the cylindrical part to and on the other side within a cap d fastened for instance by means of screws on the pedestal d. The spring 40 Z is laid around the said spindle o and abuts against two discs and 31 respectively, engaging the pedestal (Z and the slide 0 respectively.

For the purpose of adjusting the position of Y the grinding disc 0. the spindle 0 may be turned by means of a worm wheel p fastened on the upper end of the spindle o and engaging a worm q which-may be turned in any desired manner. For the purpose of retraction out of the working position, the support slide 0 is provided with a roller r, and a cam tis rotatably mounted on a shaft 3 in the machine pedestal it so formed that in the position illustrated in Figs. 1 and 2 ithas sufiicient play towards the roller 1' to allow of advance of the grinding disc, if its diameter is 5 reduced as a result of wear during working. The cam can be turned by means of the lever u mounted on the shaft 8 and the connecting rod 11, to such an extent that it raises the roller 1' and with it the grinding disc 01 against the action of the spring Z and thus brings the grinding disc :1 out of engagement with the work 1.

Figs. 1 to 5 of the drawing shows only one grinding disc but of course several grinding discs could be employed at the same time for operating on the work at its various working surfaces as shown in Fig. 6. The rod 1; may then engage simultaneously with the cam levers of the other grinding machines provided for operating on the work, so that their engagement and disengagement can be brought about simultaneously.

The grinding disc may be rotated by any suitable means. In Fig. 6 of the drawing the spindle a of the wheel is provided with a pulley 2 which may be driven.

I claim:

1. A grinding machine for grinding cutting edges on a continuously progressing steel band, comprising means to continuously feed the steel band, guides to hold and support the portion of the steel band to be momentarily worked, a grinding disc arranged opposite said guides, a slide carrying the disc, a pedestal in which the said slide is displaceable in a direction perpendicular to the disc axis, a spring arranged in the pedestal and adapted to urge the slide in a direction to engage the portion of the work guided between said guides, an adjustable abutment adapted to determine the working end position of the slide, and manually actuated means for disengaging the disc from the work counteracting to the said spring and comprising a cam roller and a cam arranged on the slide and the pedestal of the machine, respectively, and co-operating with each other but being out of contact during the working of the disc.

2. A grinding machine for grinding cutting edges on a continuously progressing steel band, comprising means to continuously feed the steel band, guides to hold and support the portion of the steel band to be momentarily worked, a grinding disc arranged opposite said guides, a slide carrying the disc, a pedestal in which the said slide is displaceable in a direction perpendicular to the disc axis, a spring arranged in the pedestal and adapted to urge the slide in a direction to engage the portion of the work guided between said guides, and manually actuated means for disengaging the disc from the work counteracting to the said spring and comprising a cam roller and a cam arranged on the slide and the pedestal of the machine, respectively, and cooperating with each other but being out of con tact during the working of the disc.

WERNER TOBIAS. 

